virtio_blk virtio5: 1/0/0 default/read/poll queues
virtio_blk virtio5: [vda] 262144 512-byte logical blocks (134 MB/128 MiB)
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.4.8107/5408 is trying to acquire lock:
ffff88801d2dc980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_add_one+0x41/0x510 fs/kernfs/dir.c:833

but task is already holding lock:
ffffffff9080a100 (gdp_mutex){+.+.}-{4:4}, at: get_device_parent+0x16f/0x3a0 drivers/base/core.c:3338

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #10 (gdp_mutex){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
       get_device_parent+0x16f/0x3a0 drivers/base/core.c:3338
       device_add+0x2d4/0xb80 drivers/base/core.c:3685
       device_create_groups_vargs drivers/base/core.c:4458 [inline]
       device_create+0x269/0x300 drivers/base/core.c:4497
       msr_device_create+0x33/0x50 arch/x86/kernel/msr.c:254
       cpuhp_invoke_callback+0x434/0x810 kernel/cpu.c:194
       cpuhp_thread_fun+0x362/0x780 kernel/cpu.c:1109
       smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162
       kthread+0x38b/0x480 kernel/kthread.c:436
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #9 (cpuhp_state-up){+.+.}-{0:0}:
       cpuhp_lock_acquire kernel/cpu.c:103 [inline]
       cpuhp_thread_fun+0x127/0x780 kernel/cpu.c:1086
       smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162
       kthread+0x38b/0x480 kernel/kthread.c:436
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #8 (cpu_hotplug_lock){++++}-{0:0}:
       percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
       cpus_read_lock+0x3d/0x160 kernel/cpu.c:490
       static_key_slow_inc+0x12/0x30 kernel/jump_label.c:190
       udp_tunnel_encap_enable include/net/udp_tunnel.h:234 [inline]
       setup_udp_tunnel_sock+0x2eb/0x4f0 net/ipv4/udp_tunnel_core.c:90
       l2tp_tunnel_register+0xe77/0x1570 net/l2tp/l2tp_core.c:1690
       pppol2tp_tunnel_get net/l2tp/l2tp_ppp.c:663 [inline]
       pppol2tp_connect+0x8e3/0x18b0 net/l2tp/l2tp_ppp.c:711
       connect_socket net/socket.c:2143 [inline]
       __sys_connect_file net/socket.c:2168 [inline]
       __sys_connect+0x316/0x450 net/socket.c:2185
       __do_sys_connect net/socket.c:2191 [inline]
       __se_sys_connect net/socket.c:2188 [inline]
       __x64_sys_connect+0x7a/0x90 net/socket.c:2188
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #7 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_sock_nested+0x41/0x100 net/core/sock.c:3908
       lock_sock include/net/sock.h:1717 [inline]
       inet_shutdown+0x6a/0x390 net/ipv4/af_inet.c:910
       nbd_mark_nsock_dead+0x2cb/0x550 drivers/block/nbd.c:319
       recv_work+0x1cee/0x1e10 drivers/block/nbd.c:1030
       process_one_work kernel/workqueue.c:3495 [inline]
       process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
       worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
       kthread+0x38b/0x480 kernel/kthread.c:436
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #6 (&nsock->tx_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
       nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
       nbd_queue_rq+0x373/0xff0 drivers/block/nbd.c:1207
       blk_mq_dispatch_rq_list+0x499/0x1990 block/blk-mq.c:2130
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
       __blk_mq_sched_dispatch_requests+0xd36/0x1580 block/blk-mq-sched.c:307
       blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
       blk_mq_run_work_fn+0x167/0x2f0 block/blk-mq.c:2545
       process_one_work kernel/workqueue.c:3495 [inline]
       process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
       worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
       kthread+0x38b/0x480 kernel/kthread.c:436
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #5 (&cmd->lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
       nbd_queue_rq+0xc1/0xff0 drivers/block/nbd.c:1199
       blk_mq_dispatch_rq_list+0x499/0x1990 block/blk-mq.c:2130
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
       __blk_mq_sched_dispatch_requests+0xd36/0x1580 block/blk-mq-sched.c:307
       blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
       blk_mq_run_work_fn+0x167/0x2f0 block/blk-mq.c:2545
       process_one_work kernel/workqueue.c:3495 [inline]
       process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
       worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
       kthread+0x38b/0x480 kernel/kthread.c:436
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #4 (set->srcu){.+.+}-{0:0}:
       srcu_lock_sync include/linux/srcu.h:225 [inline]
       __synchronize_srcu+0xca/0x2f0 kernel/rcu/srcutree.c:1662
       elevator_switch+0x1e8/0x7b0 block/elevator.c:576
       elevator_change+0x2fa/0x480 block/elevator.c:681
       elevator_set_default+0x375/0x440 block/elevator.c:754
       blk_register_queue+0x404/0x4f0 block/blk-sysfs.c:992
       __add_disk+0x6b8/0xdb0 block/genhd.c:531
       add_disk_fwnode+0x100/0x3a0 block/genhd.c:600
       add_disk include/linux/blkdev.h:798 [inline]
       nbd_dev_add+0x733/0xb60 drivers/block/nbd.c:2026
       nbd_init+0x168/0x1f0 drivers/block/nbd.c:2743
       do_one_initcall+0x250/0x870 init/main.c:1362
       do_initcall_level+0x10a/0x1a0 init/main.c:1424
       do_initcalls+0x59/0xa0 init/main.c:1440
       kernel_init_freeable+0x29d/0x3e0 init/main.c:1675
       kernel_init+0x22/0x1d0 init/main.c:1565
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #3 (&q->elevator_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
       elevator_change+0x1af/0x480 block/elevator.c:679
       elevator_set_none+0xb5/0x140 block/elevator.c:769
       blk_mq_elv_switch_none block/blk-mq.c:5113 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5158 [inline]
       blk_mq_update_nr_hw_queues+0x5ef/0x19f0 block/blk-mq.c:5223
       nbd_start_device+0x189/0xb30 drivers/block/nbd.c:1530
       nbd_genl_connect+0x167d/0x1cd0 drivers/block/nbd.c:2310
       genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2576
       genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
       netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
       netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
       sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
       __sock_sendmsg net/socket.c:818 [inline]
       ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
       ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
       __sys_sendmsg net/socket.c:2801 [inline]
       __do_sys_sendmsg net/socket.c:2806 [inline]
       __se_sys_sendmsg net/socket.c:2804 [inline]
       __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&q->q_usage_counter(io)#50){++++}-{0:0}:
       blk_alloc_queue+0x544/0x690 block/blk-core.c:504
       blk_mq_alloc_queue block/blk-mq.c:4431 [inline]
       __blk_mq_alloc_disk+0x194/0x390 block/blk-mq.c:4478
       nbd_dev_add+0x494/0xb60 drivers/block/nbd.c:1996
       nbd_init+0x168/0x1f0 drivers/block/nbd.c:2743
       do_one_initcall+0x250/0x870 init/main.c:1362
       do_initcall_level+0x10a/0x1a0 init/main.c:1424
       do_initcalls+0x59/0xa0 init/main.c:1440
       kernel_init_freeable+0x29d/0x3e0 init/main.c:1675
       kernel_init+0x22/0x1d0 init/main.c:1565
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4375 [inline]
       fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4389
       might_alloc include/linux/sched/mm.h:316 [inline]
       slab_pre_alloc_hook mm/slub.c:4636 [inline]
       slab_alloc_node mm/slub.c:4974 [inline]
       kmem_cache_alloc_lru_noprof+0x65/0x5f0 mm/slub.c:5029
       alloc_inode+0xb8/0x1b0 fs/inode.c:340
       iget_locked+0x12c/0x690 fs/inode.c:1472
       kernfs_get_inode+0x4f/0x770 fs/kernfs/inode.c:250
       kernfs_fill_super fs/kernfs/mount.c:318 [inline]
       kernfs_get_tree+0x5cd/0x980 fs/kernfs/mount.c:402
       vfs_get_tree+0x92/0x2a0 fs/super.c:1943
       fc_mount fs/namespace.c:1282 [inline]
       do_new_mount_fc fs/namespace.c:3910 [inline]
       do_new_mount+0x325/0xb00 fs/namespace.c:3986
       do_mount fs/namespace.c:4350 [inline]
       __do_sys_mount fs/namespace.c:4565 [inline]
       __se_sys_mount+0x31d/0x420 fs/namespace.c:4542
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&root->kernfs_rwsem){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3209 [inline]
       check_prevs_add kernel/locking/lockdep.c:3328 [inline]
       validate_chain kernel/locking/lockdep.c:3952 [inline]
       __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
       lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
       down_write+0x91/0x200 kernel/locking/rwsem.c:1631
       kernfs_add_one+0x41/0x510 fs/kernfs/dir.c:833
       kernfs_create_dir_ns+0x18c/0x220 fs/kernfs/dir.c:1143
       sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
       create_dir lib/kobject.c:73 [inline]
       kobject_add_internal+0x622/0xcd0 lib/kobject.c:240
       kobject_add_varg lib/kobject.c:374 [inline]
       kobject_add+0x163/0x240 lib/kobject.c:426
       class_dir_create_and_add drivers/base/core.c:3304 [inline]
       get_device_parent+0x316/0x3a0 drivers/base/core.c:3355
       device_add+0x2d4/0xb80 drivers/base/core.c:3685
       __add_disk+0x517/0xdb0 block/genhd.c:499
       add_disk_fwnode+0x100/0x3a0 block/genhd.c:600
       virtblk_probe+0x1c1b/0x2350 drivers/block/virtio_blk.c:1544
       virtio_dev_probe+0xdec/0x10b0 drivers/virtio/virtio.c:347
       call_driver_probe drivers/base/dd.c:-1 [inline]
       really_probe+0x254/0xae0 drivers/base/dd.c:706
       __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
       driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
       __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
       bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503
       __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
       device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
       bus_probe_device+0x12a/0x220 drivers/base/bus.c:623
       device_add+0x7d7/0xb80 drivers/base/core.c:3776
       register_virtio_device+0x4bd/0x6c0 drivers/virtio/virtio.c:581
       virtio_vdpa_probe+0x239/0x2f0 drivers/virtio/virtio_vdpa.c:482
       call_driver_probe drivers/base/dd.c:-1 [inline]
       really_probe+0x254/0xae0 drivers/base/dd.c:706
       __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
       driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
       __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
       bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503
       __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
       device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
       bus_probe_device+0x12a/0x220 drivers/base/bus.c:623
       device_add+0x7d7/0xb80 drivers/base/core.c:3776
       vdpasim_blk_dev_add+0x1df/0x2a0 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c:449
       vdpa_nl_cmd_dev_add_set_doit+0xa8b/0xbd0 drivers/vdpa/vdpa.c:662
       genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2576
       genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
       netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
       netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
       sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
       __sock_sendmsg net/socket.c:818 [inline]
       ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
       ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
       __sys_sendmsg net/socket.c:2801 [inline]
       __do_sys_sendmsg net/socket.c:2806 [inline]
       __se_sys_sendmsg net/socket.c:2804 [inline]
       __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &root->kernfs_rwsem --> cpuhp_state-up --> gdp_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(gdp_mutex);
                               lock(cpuhp_state-up);
                               lock(gdp_mutex);
  lock(&root->kernfs_rwsem);

 *** DEADLOCK ***

locks held by syz.4.8107/5408: 7, last CPU#1:
 #0: ffffffff912db128 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
 #1: ffffffff912daf60 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff912daf60 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff912daf60 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10b/0x7a0 net/netlink/genetlink.c:1208
 #2: ffffffff90671968 (vdpa_dev_lock){++++}-{4:4}, at: vdpa_nl_cmd_dev_add_set_doit+0x582/0xbd0 drivers/vdpa/vdpa.c:628
 #3: ffff888021b19128 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #3: ffff888021b19128 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450 drivers/base/dd.c:1073
 #4: ffff88807b3df1b0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #4: ffff88807b3df1b0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450 drivers/base/dd.c:1073
 #5: ffff88804f910a58 (&set->update_nr_hwq_lock){++++}-{4:4}, at: add_disk_fwnode+0xea/0x3a0 block/genhd.c:599
 #6: ffffffff9080a100 (gdp_mutex){+.+.}-{4:4}, at: get_device_parent+0x16f/0x3a0 drivers/base/core.c:3338

stack backtrace:
CPU: 1 UID: 0 PID: 5408 Comm: syz.4.8107 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087
 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219
 check_prev_add kernel/locking/lockdep.c:3209 [inline]
 check_prevs_add kernel/locking/lockdep.c:3328 [inline]
 validate_chain kernel/locking/lockdep.c:3952 [inline]
 __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 down_write+0x91/0x200 kernel/locking/rwsem.c:1631
 kernfs_add_one+0x41/0x510 fs/kernfs/dir.c:833
 kernfs_create_dir_ns+0x18c/0x220 fs/kernfs/dir.c:1143
 sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x622/0xcd0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x163/0x240 lib/kobject.c:426
 class_dir_create_and_add drivers/base/core.c:3304 [inline]
 get_device_parent+0x316/0x3a0 drivers/base/core.c:3355
 device_add+0x2d4/0xb80 drivers/base/core.c:3685
 __add_disk+0x517/0xdb0 block/genhd.c:499
 add_disk_fwnode+0x100/0x3a0 block/genhd.c:600
 virtblk_probe+0x1c1b/0x2350 drivers/block/virtio_blk.c:1544
 virtio_dev_probe+0xdec/0x10b0 drivers/virtio/virtio.c:347
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:623
 device_add+0x7d7/0xb80 drivers/base/core.c:3776
 register_virtio_device+0x4bd/0x6c0 drivers/virtio/virtio.c:581
 virtio_vdpa_probe+0x239/0x2f0 drivers/virtio/virtio_vdpa.c:482
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:623
 device_add+0x7d7/0xb80 drivers/base/core.c:3776
 vdpasim_blk_dev_add+0x1df/0x2a0 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c:449
 vdpa_nl_cmd_dev_add_set_doit+0xa8b/0xbd0 drivers/vdpa/vdpa.c:662
 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2576
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x8ef/0xa80 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f412139f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4122325028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4121625fa0 RCX: 00007f412139f559
RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004
RBP: 00007f4121436b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4121626038 R14: 00007f4121625fa0 R15: 00007fffe314cc08
 </TASK>
Dev vda: unable to read RDB block 8
 vda: unable to read partition table